fix(dashboard): format currency sign (#8936)

**What**
- change `formatCurrency` admin util to show sign only for negative numbers

---

FIXES CC-335

packages/admin-next/dashboard/src/lib/format-currency.ts

@@ -2,6 +2,6 @@ export const formatCurrency = (amount: number, currency: string) => {
   return new Intl.NumberFormat("en-US", {
     style: "currency",
     currency,
-    signDisplay: "always",
+    signDisplay: "auto",
   }).format(amount)
 }